diff --git a/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.md b/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.md
index 7e3c1e1..c31e1f3 100644
--- a/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.md
+++ b/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.md
@@ -603,4 +603,135 @@ It prescribes...
 | `M = 2.8` | remove `ND.56` |
 | `M = 4` 	| remove `ND.80` |
 | `M = 5.7` |remove `ND1.04` |
-| `M = 8`   |remove `ND1.31` |
\ No newline at end of file
+| `M = 8`   |remove `ND1.31` |
+
+## FADES
+
+Pictures like things fade in many ways.
+Brightness fades are gradual exposure changes leading to black, or, starting from black
+leading to normal exposure.
+
+To fade out with a positive original, exposure is decreased, either by adding ND filters to the normal pack or by closing the shutter, some more each frame.
+When the ND added is somewhat darker than the black of the original, this counts as exposure cutoff.
+
+To fade out with a negative original, with the same effect, exposure is increased, by subtracting ND filters from the normal pack, some more each frame.
+When the ND subtracted is somewhat darker than the black of the original, this counts as exposure cutoff.
+This fade is impossible without an abundant reserve of printer illumination.
+The normal pack must contain enough ND for the removal.
+An alternative is discussed below after dissolves.
+
+A fadein is the simple reverse of a fadeout.
+
+## LOG FADE
+
+The traditional fade is made from a positive and is logarithmic.
+With ND fliters a log fadeout is made by adding each new frame a certain amount more ND. 
+With reversal original, 3.00 added
+about completes the fadeout.
+For example, a 30 frame log fadeout is made by adding .10 of ND each frame.
+
+For every ND value there is an equivalent shutter angle. 
+Chart C below shows the equivalences and is adaptable to any shutter.
+A variable shutter could be callibrated in both degrees and
+ND's. 
+But toward the bottom of Chart C the angular settings are too close for ordinary variable shutters.
+Long smooth log fades from reversal original are difficult with variable shutters.
+However, from interpositive original a fade is finished at about `ND1.60`, avoiding the difficulty.
+
+## BOLEX VARIABLE SHUTTER
+
+Although it is marked in stops, it is configured for angular callibration.
+Open is 130°.
+Just closed is 0°.
+Midway is 65°.
+Percentage of full can be substituted for degrees.
+Fine callibration should not be attempted for there is play in the mechanism.
+
+## LINEAR FADE
+
+The linear fadeout, compared with the log fadeout of the sane length, starts slower and finishes faster.
+
+With a variable shutter a linear fadeout from a positive original 16 made by subtracting each new frame a certain angles.
+For simplicity, take a linear fadeout to be complete at O°.
+For example, with a 180° shutter a 30 frame linear fade changes 6° each frame.
+
+ND filters can be used to make a linear fade.
+The fade is planned as if for a variable shutter and then ND equivalents are found in Chart C.
+
+## OTHER FADES
+
+Any gradual transition between full exposure and black is an exposure fade.
+The "look", and perhaps the "meaning", of a fade depends on how the exposure changes with the frames.
+
+## FADES IN ORIGINAL 
+
+A fade made from a scene looks distinctly different from one made from a film image of the scene if the scene containga bright highlights.
+Made from the scene, the highlights shine on when the remainder of the scene is practically black.
+Made from the film, the highlights follow the other light parts of the picture.
+
+\newpage
+
+### NEUTRAL DENSITY AND EQUIVALENT SHUTTER ANGLE
+
+CHART C
+
+| NEUTRAL DENSITY | PERCENT OF FULL SHUTTER | DEGREES FOR 170° SHUTTER | DEGREES FOR \_\_° SHUTTER |
+|-----|-----|-----|-----|
+| 0.00 | 100% | 170° | ____ |
+| .05 | 89.1% | 152° | ____ |
+| .10 | 79.4% | 135° | ____ |
+| .15 | 70.8% | 120° | ____ |
+| .20 | 63.1% | 1079 | ____ |
+| .25 | 56.2% | 96°  | ____ |
+| .30 | 50.1¢ | 95° | ____ |
+| .35 | 44.7% | 76°  | ____ |
+| .40 | 39.8% | 68°  | ____ |
+| .45 | 35.5% | 60°  | ____ |
+| .50 | 31.6% | 54° | ____ |
+| .55 | 28.2% | 48°  | ____ |
+| .60 | 25, 1% | 43°  | ____ |
+| .65 | 22,48 | 38°  | ____ |
+| .70 | 20.0% | 34°  | ____ |
+| .75 | 17,84 | 30°  | ____ |
+| .80 | 15, 8% | 27°  | ____ |
+| .85 | 14.1% | 24°   | ____ |
+| .90 | 12.6% | 21,40  | ____ |
+| .95 | 11.2% | 19,19  | ____ |
+| 1.00 | 10.0% | 17.09  | ____ |
+| 1.05 | 8.91% | 15.2°  | ____ |
+| 1.10 | 7.94% | 13.59  | ____ |
+| 1.15 | 7.052 | 12.0°  | ____ |
+| 1.20 | 6.31% | 10.7  | ____ |
+| 1.25 | 5.62% | 9.6°  | ____ |
+| 1.30 | 5.01% | 8.59  | ____ |
+| 1.35 | 447% | 7-60  | ____ |
+| 1.40 | 3.98% | 6.8  | ____ |
+| 1.45 | 3.55% | 6.0°  | ____ |
+| 1.50 | 3.16% | 5.40  | ____ |
+| 1.55 | 2, 52% | 4,89  | ____ |
+| 1.60 | 2.51% | 4,30  | ____ |
+| 1.65 | 2.24% | 3.80  | ____ |
+| 1.70 | 2.00% | 3.45  | ____ |
+| 1.75 | 1.78% | 3.0  | ____ |
+| 1.80 | 1.58% | 2.7°  | ____ |
+| 1.85 | 1.41% | 2,4°  | ____ |
+| 1.90 | 1.26% | 2.149  | ____ |
+| 1.95 | 1.12% | 1.91° | ____ |
+| 2.00 | 1.00% | 70°  | ____ |
+| 2.05 | 891% | 1.52°  | ____ |
+| 2.10 |  794% | 1.35  | ____ |
+| 2.15 | . 708% | 1, 20°  | ____ |
+| 2.20 | .6312 | 1.079  | ____ |
+| 2.25 | 562% | .96°  | ____ |
+| 2.30 | 501% | 2   | ____ |
+| 2.35 | AATE | 76  | ____ |
+| 2.40 | 3985 | 68°  | ____ |
+| 2.45 | -355% | -60°  | ____ |
+| 2.50 | 3162 | «540  | ____ |
+| 2.55 | . 2828 | 48° | ____ |
+| 2.60 | 251% | 43° | ____ |
+| 2.65 | 2248 | 38  | ____ |
+| 2.70 | . 200% |  34°  | ____ |
+| 2.75 | .178% | 30°  | ____ |
+| 2.80 | 158% | . 27°  | ____ |
+| 2.85 | 141% | . 24°  | ____ |
\ No newline at end of file